پاسخ ورق های فلزی تقویت‌شده با روکش پلیمر تحت ضربه پرتابه با سرعت بالا به روش اجزاء محدود و ارائه مدلی بر اساس رگرسیون تکاملی

نوع مقاله: مقاله مستقل

نویسندگان

1 دانشجوی کارشناسی ارشد، دانشکده مهندسی برق، مکانیک و کامپیوتر، دانشگاه ایوان‌کی، ایوان‌کی، ایران

2 استادیار، دانشکده مهندسی برق، مکانیک و کامپیوتر، دانشگاه ایوان‌کی، ایوان‌کی، ایران

10.22044/jsfm.2020.8958.3029

چکیده

در این تحقیق، به بررسی عددی و مدلسازی بی‌بعد پاسخ دینامیکی ورق‌های فولادی و آلومینیومی تقویت‌شده با لایه‌های پلیمری تحت ضربه پرتابه‌های صلب با هندسه‌های مختلف پرداخته شده است. در بخش مدل‌سازی عددی از نرم فزار المان محدود آباکوس و پلی‌یومود برای شبیه‌سازی فرآیند استفاده شده است. از مدل‌های پلاستیسیته و شکست جانسون-کوک برای تعریف ماده فلزی و همچنین مدل ساختاری مونی-ریولین برای ماده پلیمری استفاده شده است. جهت صحت‌سنجی مدل عددی، مقایسه‌ای بین نتایج شبیه‌سازی با نتایج تجربی موجود در ادبیات تحقیق انجام شد. نتایج بدست آمده بیانگر دقت خوب مدل عددی در پیش‌بینی رفتار پلاستیک سازه و همپنین سرعت باقی‌مانده پرتابه بود. با استفاده از مدل عددی صحت‌سنجی شده، مطالعه‌ای پارامتریک روی رفتار ساختارهای فلز-پلیمر تحت برخورد پرتابه با هندسه‌های مختلف انجام شد و از نتایج بدست آمده برای ارائه یک مدل ریاضی جهت تخمین سرعت باقی‌مانده پرتابه استفاده شد. به‌منظور مدل‌سازی ریاضی، اعداد بی‌بعد جدیدی برای فرآیند نفوذ پرتابه در اهداف فلز-پلیمر با استفاده از بی‌بعدسازی معادلات تعادل دینامیکی حاکم بر ورق ارائه شد.

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